Furnace-grate.



1.11?. DAWSON.

FURNAGE GRATB.

APPLICATION FILED SEPT. 1, 1910.

PatentedMay 30, 1911.

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A. F. DAWSON.

FURNAGE GRATB.

APPLICATION FILED SEPT. lI 1910.

Patented May 30, 191.1.

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... -1 'l n` u lult h- III ATTORNEY.

THE Nonms PE1-:Rs co., WASHINGTON, D, cA

WEEE@ STATES# PATENT @FFFCFQ ALFRED F. DAWSON, OF lVIILlVIONT, RIIDLEY TOWNSHIP, DELAWARE COUNTY, PENN- SYLVANIA.

FURNACE-GRATE.

seance.

To all whom 'it may concern:

Be it known that I, ALFRED F. DAWSON, a citizen of the United States, residing at Milmont, township of Ridley, county of Delaware, and State of Pennsylvania, have invented certain new and useful Improvements in Furnace-Grates, of which the following is a specification.

This invention relates to furnace grates and has more particular relation to that class of moving grates known as the rolling or rocking bar type.

The principal object of the present invention may be said to be the providing of a furnace grate so arranged, constructed and connected as to obtain more eflicient results in a more economical manner than have heretofore been possible with other devices of like character.

A further object of the present invent-ion is to provide a furnace grate constructed to provide for the admission of an increased volume of air upwardly through the grate whereby the gaseous products may be caused to be more readily consumed, thus eliminating to a great'degree smoke.

A still further object of the present invention is to provide a grate in which are present interchangeable end cross-pieces for t-he main frame provided with air ducts leading from the outside to the inside of the grate.

A still further obj ect of the present invention is to provide a grate in which the castiron grate bars are reinforced throughout their length by wrought iron spiral rods.

A still further object of the present invention is to provide an adjustable supporting frame for the grate in which the adjusting parts are provided with serrated portions to prevent slippage when the parts are in adjusted position.

A still further object of the present invention is to provide a grate in which the pendent connection between the grate bars and operating rod is strengthened by the providing of dove-tail connections between the grate bar and pendent arm whereby shearing strain on the securing bolt is eliminated.

Other objects of the invention relate to the providing of various details of co-nstructions and arrangements of parts whereby a grate of the type recited is rendered commercially valuable.

The invention consists of the improvements hereinafter set forth and finally claimed.

Speeication of Letters Patent.

Application filed September 1, 1910.

Patented May 30, 1911.

Serial No. 580,003.

The nature, characteristic features and scope of the invention will be more fully understood from the following, description taken in connection with the accompanying drawings forming part hereof and in which:

Figure l, is a longitudinal sectional view of a furnace equipped with a grate construction embodying the invention, Fig. 2, is a sectional view taken upon the line 2-2 of the grate shown in Fig. 1, but drawn to an enlarged scale, Fig. 3, is a fragmentary horizontal sectional view of the grate construction illustrating details of construction, Fig. 4, is a fragmentary view principally in section illustrating the air ducts in the end cross-pieces and also illustrating the grate bars in shifted or open position, Fig. 5, is a fragmentary view in elevation of one of the end cross-pieces shown in Figs. 3, and 4, Fig. 6, is a view in elevation thereof looking from the inside of the grate, Fig. 7, is a detail view in elevation illustrating the manner of connecting the grate bars with t-he pendent arms, and, Figs. 8, and 9, are views in elevation and plan respectively of the operating lever.

As shown in the drawings the grate l, is superposed upon a generally rectangular framework 2, which in turn is supported by legs 3, which rest upon the floor or bottom of the ash-pit 4, of the furnace 5. As clearly illustrated in Figs. 1, and 2, the legs 3, which support the framework 2, are arranged with respect thereto, so that the grate may be adjusted to different heights. This is important as the top of the grate should be on a line with the bottom of the feed door opening 6. A description will now be given of this adjustable feature. The legs 3, are provided with foot portions 7, and slotted upper portions 8. The upper portions are also serrated or toothed as at 9. The serrated portions 9, register with the serrated portions 10, of depending eXtensions 11, of the frame 2. Bolts and nuts 12, are present for clamping together the legs 3, and extensions 11. By this construction and arrangement of parts, when the grate 1, is adjusted and clamped to the required height the serrated portions prevent slippage between the parts thereby providing an efficient adjustment.

The frame which supports the grate bars 1, comprises end plates 13, and 14, connecting which are spaced side bars 15. The end plates 13, and 14, and side bars 15, are connected together through the instrumentality of angular plates 16, carried by the extensions 11, rivets or their equivalents 17, being utilized for securing the respective parts one to another. Interchangeably supported by the plates 13, and 14, are end crosspieces 18, provided across their entire length withalternately disposed lugs and depressions 19, and 20, the depressions 20, serving to permit air to pass up through the furnace. As clearly illustrated in Figs. 4, and 6, air ducts 21, are present between the outer walls of the plates 13, and 14, and the inner walls of the members 18, which communicate with some of the said depressions 20. It will be noticed that air, by reason of this arrangement and construction of parts, passes upwardly from the outside of the grate to and through the grates interior. It may be here remarked that by making the cross-pieces interchangeable, new parts may be adjusted to place without in any way affecting the framework. This is advantageous should a cross-piece burn out.

The grate bars proper are pivotally supported upon the side bars 15. A description will now be given of these grate bars, reference being had more particularly to Figs. 2, 3, and 4. These grate bars comprise web portions 22, having formed integral therewith leaves 23, having straight portions 50, terminating in a generally conveX curve. The leaves 23, are shown as having staggered relation with one another. To strengthen the general construction of the grate bars and more particularly the web portions the said webs are reinforced, when the grate bar is cast, by means of a reinforcing rod 24, shown in the drawings as being of spiral contour. The cross-section of the spiral reinforcing rod being irregular, the metal of the web in casting flows in and around the irregular portions of the reinforcing rod and provides a web possessed of great strength. As illustrated in Figs. 2, and 3, the web 22, just described is provided with bearings 25, between the leaves 23, the said bearings resting in recessed portions 26, upon the side rails 15. As it will be readily apparent from the drawings the spaces between the leaves are quite narrow, consequently the side rails 15, must be quite narrow to fit therebetween. As the said rails 15, are comparatively thin in cross-section it has been found necessary to stilfen the same by reinforcing strips 27, and 28, arranged adjacent the lower parts of said rails, see Fig. 2. Connect-ing each of the grate bars 1, and the oscillating rod 29, are pendent arms 30. As shown in Fig. 1, the pendent arms 30, have pivotal connections as at 31, with the oscillating rod 29, and are provided at their upper portions with a recessed portion 32, adapted to receive a depending portion 33, of the grate bars. As clearly illustrated this forms a dovetail coupling. Bolt and nut connections 34, are present to hold these parts together. 1n this connection the above recited parts serve to strengthen the connecting members and likewise serve to eliminate shearing strain of the grate bars upon the bolt connections 34. As shown in Fig. 2, the parts 33, are located upon opposite ends of the grate bars so that the operating levers may be connected from either side. Pivotally connecting the oscillating bar 29, and the operating lever 35, is a rod 37, see Figs. 1, 8, and 9.

As clearly shown in Figs. 8, and 9, the rodv 37, is fitted within a socket 38, and secured thereto by means of a screw 39. The socket 38, in turn has pivotal connection with the operating lever 36. The lever 35, has eX- tending forwardly therefrom a lug 40, centrally apertured, and the socket 38, has eX- tending forwardly therefrom a pair of lugs 41, that straddle the lug 40, the lugs 41, being also apertured, The said apertures are adapted to register with the opening in the lug 40, when the grate bars are in the position shown in Fig. 1, a pin 43, being present to lock the part-s together. When in this position the grate bars cannot be moved but by removing vthe pin 42, the parts are free to operate. The lever 35, has pivotal relation as at 43, with a link 44, which in turn has pivotal relation with the furnace 5.

It is thought that t-he operation of the above described grate will be understood without resort to further description. 1t may be remarked, however, that when moving the grate from the position shown in Fig. 1, to that shown in Fig. 4, a relatively large opening is created between adjacent grate bars thereby permitting clinkers and the like to readily pass to the ash-pit. However, by virtue of the straight portions 50, of the grate bars a relatively small opening may be made by a slight movement of the operating leverl to permit tine ashes to gravitate to the ash-pit withoutdisturbing the bed of fuel. Further a large amount of air is permitted to pass up through the grate bars by virtue of the staggered relation of the leaves of the grate bars and the air ducts in the end cross-pieces 18. This large admission of air serves to cause a furnace to consume practically all of the gases within the combustion chamber thereby eliminating smoke, and in practice demonstrating that a saving of fuel to the extent of at least 28 per cent. may be effected.

Having thus described the nature and objects of the invention what I desire to secure by Letters Patent is:

1. A grate bar comprising a cylindrical rib having formed integral therewith transversely extending staggered leaves and a one piece reinforcing element embedded in its entirety within said rib and extending throughout the length thereof.

2. A grate bar comprising a cylindrical rib having formed integral therewith transversely extending staggered leaves and a one piece reinforcing element of relatively large cross-section embedded in its entirety within said rib and extending throughout the length thereof.

A cast iron grate bar comprising a cylindrical rib having fo-rmed integral therewith transversely extending staggered leaves each of said leaves having convexed top sur. faces and two opposite straight perpendicular ends and a wrought iron reinforcing bar of relatively large cross-section embedded in its entirety within said rib and extending' throughout the entire length thereof.

at. grate bar comprising a cylindrical rib having formed integral therewith transversely extending leaves and a one piece spirally form-ed wrought iron reinforcing bar wholly embedded within said rib and extending throughout the length thereof, said reinforcing bar forming an interlocking connection with said cylindrical rib.

5. ln a grate construction, a frame consisting of side bars and end plates, grate parts carried by said side bars and crosspieces detachably secured to the outer sides of said end plates the cross-pieces being provided upon their inner faces 'with laterally disposed alternately arranged lugs and depressions, air ducts being formed between the abutting faces of the end plates and the cross-pieces which communicate with some of said depressions, whereby air may pass upwardly from the outside of the grate to and through the grates interior.

6. In a grate construction, a frame consist-ing of side bars'and end plates, grate bars provided with staggered leaves journaled in the side bars said staggered leaves permitting free access of air between the grate bars, means for rocking said grate bars, cross-pieces detachably secured to the outer sides of said end plates t-he cross-pieces being provided with laterally disposed alternately arranged lugs and depressions at their tops and recessed portions at their bottoms forming air ducts between the outer faces ofthe end plates and the inner faces of the cross-pieces, said air ducts communieating with some of said depressions, whereby air may pass upwardly from the outside of the grate to the grates interior and between said staggered leaves.

7. ln a grate construction, a frame consisting of side bars and end plates, grate parts carried by said side bars, cross-pieces detachably secured to the outer sides of said end plates the cross-pieces being provided npon their inner faces and adjacent their tops with laterally disposed alternately arranged lugs and depressions and being further provided upon their inner faces and below said lugs and depressions with recesses forming air ducts between the outer faces of the end plates and the inner faces of the cross-pieces which communicate with some of said depressions, whereby air may pass upwardly from the outside of the grate to and through the grates interior.

ln testimony whereof I have hereunto signed my name.

ALFRED F. DAVSON.

Witnesses:

WILLIAM J. JACKSON, AGNES Casxnx.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of atents, Washington, D. C. 

